Chapter 16: Spinal Cord and Spinal Nerves

Question 0

arachnoid mater

Answer 0

middle, spider-web like layer
subarachnoid space - bridges the gap between the arachnoid epithelium and the innermost meningeal layer
CSF - acts as a shock absorber as well as a diffusion medium for dissolved gases, nutrients, chemical messengers, and waste products

Question 1

dura mater

Answer 1

outer covering
epidural space - fat tissue, where epideral anestheia is placed
subdural space
tough, fibrous
layer of dense irregular CT whose inner/outer surface is covered by simple squamous

Question 2

Pia mater

Answer 2

innermost layer
denticulate ligaments - trying to hold cord in place
blood vessels
glistening layer
hard to pin on cadavers

Question 3

ascending tracts of spinal cord

Answer 3

carry sensory information toward the brain

Question 4

descending tracts of the spinal cord

Answer 4

convey motor commands into the spinal cord

Question 5

ascending

Answer 5

sensory

Question 6

first order neurons

Answer 6

the sensory neuron that delivers the sensations to the CNS

it’s cell body is in a dorsal ganglion or cranial nerve ganglion

Question 7

second order neurons

Answer 7

an interneuron upon which the axon of the 1st order neuron synapses
the 2nd order neurons cell body may be located in either the spinal cord or brain stem

Question 8

3rd order neurons

Answer 8

carries the sensory information from the thalamus to the appropriate sensory area of the cerebral cortex